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I think the question is incomplete. If you are just trying to install the software, system with 10 GB disk space and 2 GB RAM should be sufficient.

But I guess the correct question is what is minimum system requirement to use these software ? Right ?

The system requirement for the use will depend on what sort of problems you want to solve. What will be maximum cell count you want to solve for and how fast you want the results. Its general guideline that you should have 1 GB RAM for 1 million cells. Please take this only as a guideline.

Please do google with search keywords as "System requirement of CFD", and you will find many references. Few of them are following: